Thanks for finding that. It's a good article with a lot of practical and interesting information.
I think hormone therapy should definitely vary by ethnicity, but it probably won't for awhile. It still barely varies by age or weight or much else because doctors are still learning best practices, and research about or including transgender people was just a trickle until recently. The thing with treating Asians and other non-caucasion groups based on studies of entirely white people is a lot like how so much psych research is done on affluent undergraduates. We'll have to fine-tune this stuff eventually if we want effective care to happen.